Mailman 3 June 2012 - Tkinter-discuss

Control position of Tkinter common dialogs?
by python＠bdurham.com Dec. 9, 2016

Dec. 9, 2016

Python 2.7 under Windows: How can we control the position of Tkinter's common dialogs? Here's what we've discovered: * Certain common dialogs always open up relative to their parent window * Certain common dialogs always open up centered on the user's desktop * All common dialogs appear to ignore the optional parent= parameter Questions: * How can we force a dialog to open up relative to its parent window? * How can we force a dialog to open up centered on the user's desktop? Background: import tkColorChooser as colorchooser import tkFileDialog as filedialog import tkMessageBox as messagebox # always open up relative to parent windows fileOpen = filedialog.askopenfilename() fileOpens = filedialog.askopenfilenames() fileSaveAs = filedialog.asksaveasfilename() color = colorchooser.askcolor() # always open up centered on desktop folderOpen = filedialog.askdirectory() messagebox.askquestion() Malcolm

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Segfault in Image.PhotoImage on OS X
by Marc Culler Nov. 14, 2012

Nov. 14, 2012

This was reported here in February, but no debugging information was provided by the reporter: http://stackoverflow.com/questions/9142786/python-imagetk-photoimage-segfau… <view-source:http://stackoverflow.com/questions/9142786/python-imagetk-photo…> I can explain the nature of the problem, but I don't know how to fix it correctly. I am using the standard x86_64 Python 2.7.2 package from python.org and I have installed Active State Tcl/Tk 8.11. When I tried using easy_install to install PIL it would not load, claiming that _imaging.so did not exist. In fact, it existed but was only a thin i386 executable. So I compiled Imaging-1.1.7 with export CFLAGS='-arch i386 -arch x86_64' and export TCL_ROOT=/Library/Frameworks/Tcl.framework/Versions/8.5/Tcl I was then able to load the module. However, the following code produced a segfault: import Image import ImageTk import Tkinter W = Tkinter.Tk() Im = Image.open('test_image.jpg') x = ImageTk.PhotoImage(Im) The crash occurs in Tk_GetImageMasterData. More importantly, though, the crash was preceded by the following messages: objc[36554]: Class TKApplication is implemented in both /Library/Frameworks/Tk.framework/Versions/8.5/Tk and /System/Library/Frameworks/Tk.framework/Versions/8.5/Tk. One of the two will be used. Which one is undefined. objc[36554]: Class TKMenu is implemented in both /Library/Frameworks/Tk.framework/Versions/8.5/Tk and /System/Library/Frameworks/Tk.framework/Versions/8.5/Tk. One of the two will be used. Which one is undefined. objc[36554]: Class TKContentView is implemented in both /Library/Frameworks/Tk.framework/Versions/8.5/Tk and /System/Library/Frameworks/Tk.framework/Versions/8.5/Tk. One of the two will be used. Which one is undefined. objc[36554]: Class TKWindow is implemented in both /Library/Frameworks/Tk.framework/Versions/8.5/Tk and /System/Library/Frameworks/Tk.framework/Versions/8.5/Tk. One of the two will be used. Which one is undefined. Guessing that PIL was finding the System/Library/Frameworks/Tk.Framework instead of /Library/Frameworks/Tk.Framework, I tried hiding the system Tcl and Tk frameworks by renaming them. I was then able to create the PhotoImage and display it. I don't know where those messages come from, and I have never encountered them before. But I am guessing they are from OS X, since they are generated by an objective C program. Evidently _tkinter.so is able to specify which Tk.Framework to use. I don't know its mechanism for doing that. But, somehow, PIL is not doing it, and it ends up using the wrong one. A stack trace of the crash is below. - Marc 0x000000011517bccd in Tk_GetImageMasterData () (gdb) bt #0 0x000000011517bccd in Tk_GetImageMasterData () #1 0x0000000115183d9f in Tk_FindPhoto () #2 0x00000001014fbadc in PyImagingPhotoPut () #3 0x000000011502a05b in TclInvokeStringCommand () #4 0x000000010102142a in TclEvalObjvInternal () #5 0x000000010102261c in Tcl_EvalObjv () #6 0x000000010100646d in Tkapp_Call () #7 0x00000001000c102d in PyEval_EvalFrameEx () #8 0x00000001000c2d29 in PyEval_EvalCodeEx () #9 0x00000001000c0b6a in PyEval_EvalFrameEx () #10 0x00000001000c2d29 in PyEval_EvalCodeEx () #11 0x000000010003da80 in function_call () #12 0x000000010000c5e2 in PyObject_Call () #13 0x000000010001ebcb in instancemethod_call () #14 0x000000010000c5e2 in PyObject_Call () #15 0x00000001000ba5f7 in PyEval_CallObjectWithKeywords () #16 0x0000000100021e5e in PyInstance_New () #17 0x000000010000c5e2 in PyObject_Call () #18 0x00000001000be5f3 in PyEval_EvalFrameEx () #19 0x00000001000c2d29 in PyEval_EvalCodeEx () #20 0x00000001000c2e46 in PyEval_EvalCode () #21 0x00000001000e769c in PyRun_InteractiveOneFlags () #22 0x00000001000e78fe in PyRun_InteractiveLoopFlags () #23 0x00000001000e80e1 in PyRun_AnyFileExFlags () #24 0x00000001000fe77c in Py_Main () #25 0x0000000100000f14 in dyld_stub_strlen ()

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setting a minsize for gridded windows
by Mark Summerfield June 29, 2012

June 29, 2012

Hi, I want to set a minsize for a window. Sometimes the window is gridded and sometimes not. When it is gridded its winfo_reqwidth() is in characters not pixels and vice versa. Is there any way to tell whether it is using characters or pixels so that I can call minsize() with sensible values (e.g., minsize(100, 100) if pixels but minsize(10, 10) if characters). Thanks! -- Mark Summerfield, Qtrac Ltd, www.qtrac.eu C++, Python, Qt, PyQt - training and consultancy "Advanced Qt Programming" - ISBN 0321635906 http://www.qtrac.eu/aqpbook.html

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Text undo/redo stack
by Mark Summerfield June 25, 2012

June 25, 2012

Hi, I can enable/disable an undo button for a Text widget depending on Text.edit_modified(); i.e., if it is modified then I can safely call undo. But what I'd really like to do is just check the undo *and redo* stacks to see whether they are empty and enable/disable based on that. Is this possible? Thanks! -- Mark Summerfield, Qtrac Ltd, www.qtrac.eu C++, Python, Qt, PyQt - training and consultancy "Rapid GUI Programming with Python and Qt" - ISBN 0132354187 http://www.qtrac.eu/pyqtbook.html

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BooleanVar() etc.
by Mark Summerfield June 24, 2012

June 24, 2012

Hi, Right now it is possible to do bv = BooleanVar() bv.set(any_old_rubbish) b = bv.get() # b is an int not a bool I've reported this as a bug and commented that I think that BooleanVar, IntVar, FloatVar, and StringVar should honor the type in their names (i.e., bool, int, float, str). If this matters to you could you look at the issue and maybe comment? http://bugs.python.org/issue15133 -- Mark Summerfield, Qtrac Ltd, www.qtrac.eu C++, Python, Qt, PyQt - training and consultancy "Programming in Go" - ISBN 0321774639 http://www.qtrac.eu/gobook.html

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Problems with popup menus
by Mark Summerfield June 21, 2012

June 21, 2012

Hi, I am trying to create a popup menu that works like a pulldown menu, that is, it: (1) supports up and down arrow navigation and Enter to select, (2) supports keyboard mnemonics (e.g., type 'b' to select Blue item), (3) is cancelled with Escape. Here is an example that doesn't support any of the above (yet all of the above work automatically for menus in a menu bar). ############################################################ # Adapted from # http://www.java2s.com/Code/Python/GUI-Tk/Popupmenudemonstration.htm from tkinter import * class PopupMenuDemo(Frame): def __init__(self): Frame.__init__(self) self.pack(expand=YES, fill=BOTH) self.master.title("Popup Menu Demo") self.master.geometry("300x200") self.frame1 = Frame(self, bg="white") self.frame1.pack(expand= YES, fill=BOTH) self.popupMenu = Menu(self.frame1, tearoff=0) self.popupMenu.bind("<q>", self.popupMenu.unpost) # Doesn't work self.popupMenu.bind("<Escape>", self.popupMenu.unpost) # Doesn't work colors = ["White", "Red", "Green", "Blue"] self.selectedColor = StringVar() self.selectedColor.set(colors[0]) for color in colors: self.popupMenu.add_radiobutton(label=color, variable=self.selectedColor, underline=0, command=self.changeBackgroundColor) self.frame1.bind("<Button-3>", self.popUpMenu) def popUpMenu(self, event): self.popupMenu.post(event.x_root, event.y_root) def changeBackgroundColor(self): self.frame1.config(bg=self.selectedColor.get()) PopupMenuDemo().mainloop() ############################################################ Any advice on this would be appreciated:-) -- Mark Summerfield, Qtrac Ltd, www.qtrac.eu C++, Python, Qt, PyQt - training and consultancy "Rapid GUI Programming with Python and Qt" - ISBN 0132354187 http://www.qtrac.eu/pyqtbook.html

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Focus for first key press
by Mark Summerfield June 21, 2012

June 21, 2012

Hi, I have a couple of Tkinter applications and what I've noticed is that if I do Alt+F as soon as they start (i.e., for Alt+F,N for New or Alt+F,O for Open), the keypress is ignored! It works fine the second and all subsequent times. I've tried calling focus() on the invisible root window & on the topmost visible window, but neither has any effect. Can anyone tell me a solution? Thanks! -- Mark Summerfield, Qtrac Ltd, www.qtrac.eu C++, Python, Qt, PyQt - training and consultancy "Programming in Python 3" - ISBN 0321680561 http://www.qtrac.eu/py3book.html

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is it possible to use a local tcl/tk with a local python?
by Mark Summerfield June 18, 2012

June 18, 2012

Hi, Right now I have several local pythons so that I can test against multiple versions, e.g., ~/opt/python31 ~/opt/python32 ~/opt/python33 But all of these use the system-wide Tcl/Tck (8.5.11) in /usr/lib. What I'd really like to do is have: ~/opt/python31tk85 ~/opt/python32tk85 ~/opt/python33tk85 ~/opt/python31tk86 ~/opt/python32tk86 ~/opt/python33tk86 where these are built with one of these: ~/opt/tcltk85 ~/opt/tcltk86 But I can't figure out how to tell Python's configure to use a local Tcl/Tk. Can anyone advise me? Thanks! -- Mark Summerfield, Qtrac Ltd, www.qtrac.eu C++, Python, Qt, PyQt - training and consultancy "Advanced Qt Programming" - ISBN 0321635906 http://www.qtrac.eu/aqpbook.html

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a couple of mac menu problems
by Mark Summerfield June 18, 2012

June 18, 2012

Hi, I'm trying to develop a cross-platform Tkinter app. Here's a bit of code used to create the Help menu: if MAC: self.master.createcommand("tkAboutDialog", self.about_action) self.master.createcommand("::tk::mac::ShowHelp", self.help_action) helpMenu = tk.Menu(self.menubar, name="help") helpMenu.add_command(label="Help", underline=0, command=self.help_action) if not MAC: helpMenu.add_command(label="About", underline=0, command=self.about_action) self.menubar.add_cascade(label="Help", underline=0, menu=helpMenu) I end up with these menus: ActivePython3.2 About ActivePython3.2 # correctly invokes my about action ... Help Search # some apple-specific thing that just appears ActivePython3.2 Help # invokes my help action Help # invokes my help action Problems: (1) I don't know how to rename the "ActivePython3.2" menu to "My App". (2) I don't know how to rename the "About ActivePython3.2" menu option to "About" or "About My App". (3) I don't know how to eliminate the "ActivePython3.2 Help" menu option. If I don't do helpMenu.add_command() on the Mac that menu has no items ('cos the About is in the ActivePython3.2 menu) and so the Help menu doesn't appear at all. Can anyone advise? Thanks! -- Mark Summerfield, Qtrac Ltd, www.qtrac.eu C++, Python, Qt, PyQt - training and consultancy "Advanced Qt Programming" - ISBN 0321635906 http://www.qtrac.eu/aqpbook.html

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Re: [Tkinter-discuss] a couple of mac menu problems
by Kevin Walzer June 16, 2012

June 16, 2012

On 6/15/12 8:05 PM, Lynn Oliver wrote: > CDBundleName is not in the info.plist file; "Bundle name" is the name of the app. > On Jun 15, 2012, at 4:13 PM, Kevin Walzer wrote: > >> Myapp.app/Contents/info.plist Can you attach a copy of your info.plist file, or post a link to the app so I can download it and take a look? (I'm curious to see what a pyinstaller app looks like, anyway.) --Kevin -- Kevin Walzer Code by Kevin http://www.codebykevin.com

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